Doorknob



Nov. 18, 1924. 1,516,152

J. R. DUMONT DOORKNOB Filed April 25.1923

' Patented Nov. 18, 1924.

entree aosnrn a. numon'r, or KANSAS em. mssonni.

DOOBKNOB.

Application filed April 23, 1923. Serial No. 634,148.

To all whom it may concern:

Be it known that I, JOSEPH R. DUMoN'r, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Doorknobs;

and I do declare the following to be a full,

clear, and exact-description of the invention,

such as will enable others skilled in the art to which it appertains to make and. use the same, referencebeing had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification. I

This invention relates to door knobs and particularly to a door knob which may be fastened to the spindle of a lock by means of a slip clutch, the clutch being effective to maintain the knob in non-rotative relation with respect to the spindle under normal conditions but permitting the knob to turn independently of the spindle under abnormal conditions as, for example, when the spindle is obstructed in its rotative movement by the lock.

While the invention is not necessarilylimited to the application to a coin-controlled lock, it is particularly designed therefor because considerable damage is done to coincontrolled locks due to the fact that after the depositor places a coin in the mechanism, he is generally insistent upon operating the lock, even to the detriment of the mechanism.

The invention is particularly designed for lavatory locks where the depositor deposits a coin, check or token in order to render the lock operative. If for any reason the lock fails to operate after the coin is deposited, the person placing the coin in the lock is liable to turn or wrench the spindle so that the interior lockmechanism becomes damaged.

According to my invention the knob to all intents and purposes would be' rigid with the spindle under normal conditions. However, if the lock fails to operate, the continued turning of the knob in either direction after the spindle is arrested or after the spindle is obstructed in its turning movement will permit the knobto slip or continue to turn without disarranging any of the interior mechanism of the lock.

The invention consists in certain novel details of construction and comb nations of parts, all of which W111 be specifically reconvenient manner. fixed clutch disk 2 having outwardly projectferred to hereinafter, reference being had to the accompanying drawings, in. which- Fig. 1 is a view of a coin-controlled lock to which my invention is applied.

Fig. 2 is a vertical, longitudinal, sectional view showing the knob in releasing or slipping position.

Fig. 3 is a similar view showing the knob clutched to the spindle.

gig. at is a disassociated view of the parts, an

Fig. 5 is a perspective view of the inner face of the slip clutch element.

Referring now to the drawings by nun1er-.

als of reference:

1 designates a spindle which may be fastened to the interior lock mechanism in any The spindle carries a ing lugs3. The disk 2 carries a centrally located annular boss 4 and the boss is adapted to enter an angular opening 5 in a clutchdisk member 6. The clutch disk member 6 1s 'provlded on its inner face with lugs 7 8 adapted'to engage the inwardly directed complementary clutch proiections 9 on the knob 10. The knob is in the form of a hollow casing. It is preferably cup-shaped and embraces the members 2 andG and is loosely secured about them by a coverplate 11 which may be secured to the knob by peenin'g over the edge 12 of the-knob when the cover plate is in the position shown in Figs. 2 and 3. The clutch disk or member 6 is normally urged into clutching engagement with the clutch rejections 9 by springs 13 mounted about t e "lugs 3 and 7 and interposed be.- tween the disks or plates 2 and 6.

When the parts are assembled, the clutch projections 8 are in clutching engagement with the projections 9 on the knobs. The springs 13 are strong enough to maintain the projections 8 and 9 in clutch engagement under normal conditionsso that when the knob 10 is turned, the clutch plate or disk 6 will be turned. Since the clutch plate disk 6 is in angular engagement with the boss 4, the boss 4 will be turned with it and inasmuch as the boss 4 is rigid with the spindle 1, it is obvious that the spindle will be turned. I

to ride over the curved projections 8 so that the knob can be turned about the disk 6, it being understood, of course, that the cover plate 11 rotates with the knob since the spindle projectsloosely through the openin 14 in the cover plate 11. Therefore, it wil be impossible to turn the spindle 1 when its resistance is great enough to cause slippage of the knob with respect to the rest of the mechanism.

It will be observed that the projections 8 exceed in number those designated 9. Tn the drawings ll have shown twice as many project-ions 8 as there are projections 9. The purpose of this is to always present a clutching portion on the disk 6 to one of the projections 9. lit the projections 8 were spaced as far apart as the projections 9, there would be a loose pla between the knob and the clutch disk 8 be ore the two could move together but constructed as shown in Fig. 4:, there will be practically no play between the disk 6 and the knob.

The slip clutch arrangement between the spindle and the knob will prevent the mecha nisnrin the lock from becoming damaged and this ll find an important feature where publicly operated locks are involved.

What ll claim and desire to secure by Letters-Patent is:

2. In combination, a splndle having a disk.

rigid thereon, a spring-pressed disk in spaced relation with the first-named disk inwardly directed projections, a spindle loosely secured to the knob, and a springpressed disk mounted to rotate with the spindle and having means engageable by the projections on the knob. I

t. In combination, a spindle, a disk rigid therewith, lugs projecting from the disk, an angular boss projecting centrally from. the disk, a second disk having an angular opening engaged by the angular boss, lugs on the inner face of the second disk, springs mounted between the disks and about the lugs, projections on the outer face of the second disk, and a knob engaging the disks and loosely mounted about the spindle, the knob having projections engaging the projections on the outer face of the second disk.

5. In combination, a spindle, a disk rigid therewith, lugs projecting from the disk, an angular boss projecting centrally from the disk, a second disk having an angular opening engaged b the angular b ss, lugs on the inner face of t e second disk, springs mounted between the disks and about the lugs, projections on the outer face of the second disk, and a knob engaging the disks and loosely mounted about the spindle, the knob having projections engaging the projections on the outer face of the second disk, the pro jections on the outer face of the second disk exceeding in number those extending inwardly from the knob.

In testimony whereof ll atiix my signature.

JOSEPH lit. DUMQNT.

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